<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <!-- 准备好一个容器 -->
    <div id="test"></div>

      <!-- 引入react核心库 -->
      <script src="../js/react.development.js"></script>
      <!-- 引入react-dom，用于支持 react操作dom-->
      <script src="../js/react-dom.development.js"></script>
      <!-- 引入babel，用于将jsx转为 js-->
      <script src="../js/babel.min.js"></script>

      <script type="text/babel">
        // 1.创建组件
        class Demo extends React.Component{
            state = {isHot:true};
            render(){
                const {isHot} = this.state
                return(
                    <div>
                        <h1 >今天天气很{isHot===true?'凉爽':'炎热'} </h1>
                      {/* <input  ref={(cNode)=>{this.input1=cNode;console.log('#',cNode)}} type="text" placeholder="点击按钮提示数据"/> &nbsp; */}
                      <input  ref={this.saveInput} type="text" placeholder="点击按钮提示数据" /> &nbsp;
                      <button onClick={this.showData}>点我提示数据</button> &nbsp;
                        <button onClick={this.changeData}>点我切换天气</button>
                    </div>
                )
            }
            saveInput = (cNode)=>{
                this.input1 = cNode;
                console.log('@',cNode);
            }

            changeData = ()=>{
                const {isHot} = this.state
               this.setState({isHot:!isHot});
               
            }
            // 展示左侧输入框的数据
            showData = ()=>{
                // 函数体

               const {input1} =this;
               alert(input1.value);
            }
        
        }
        // 2.渲染组件到页面
        ReactDOM.render(<Demo/>,document.getElementById('test'));
      </script>
</body>
</html>